反应详情

A stirred solution of 4-nitrophenyl 2-pyridyl sulfone (6.50 g, 24.6 mmol) and stannous chloride dehydrate (27.72 g, 123.0 mmol) in absolute ethanol (200 mL) was heated at reflux for 25 min. The reaction mixture was poured into ice water, and the aqueous solution basified with sodium bicarbonate (pH=8-9) and extracted with ethyl acetate (2×400 mL). The organics were combined, dried (MgSO4), filtered, and the solvent distilled to yield the title benzenamine (5.12 g, 89%) as a white solid; mp 158°-160° C. 1H--NMR (300 MHz, d6 --DMSO): 6.27 (broad s, 2H, NH2), 6.66 (d, 2H, J=8.7 Hz, aromatic), 7.61 (m, 3H, aromatic), 8.08 (d, 2H, J=4.9 Hz, aromatic), 8.68 (d, 1H, J=4.9, aromatic). MS (CI, CH4): 235(M+1).

1. temperatureat reflux for 25 min
2. extractionextracted with ethyl acetate (2×400 mL)
3. dry with materialdried (MgSO4)
4. filtrationfiltered
5. distillationthe solvent distilled